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This article presents results of radon (Rn) and thoron (Rn) concentrations in room air measured inside mud-built houses that are traditional dwellings on the Dong Van Karst Plateau. The measurements were conducted in December 2016 and July 2017, corresponding to “cold” and “warm” months, respectively, by using a portable RAD7 detector. Our results show that Rn and Rn concentrations were elevated during the “warm” month and the concentrations of Rn were always higher than the respective Rn values at the same measured locations during the two months. The relatively long half-life of Rn (3.83 days) causes efficient dispersion and loss from room air due to air ventilation. In contrast, the much shorter half-life of Rn (55.6 seconds) results in elevated radiation near mud surfaces prior to attenuation into room air further away from walls and floors. Average concentrations of Rn in room air during both “cold” and “warm” months are much higher than in normal outside air (~10 Bq m). The severely elevated concentrations of Rn in room air of mud-built homes are likely harmful to human occupants, especially to those sleeping near mud-walls.

tạp chí khoa học đại học quốc gia hà nội: nghiên cứu giáo dục  (vnu journal of science: education research)/tạp chí khoa học đại học quốc gia hà nội: các khoa học trái đất và môi trường (vnu journal of science: earth and environmental sciences)

Radon Concentrations and their Controlling Factors in Mud-built Houses in Dong Van Plateau Karst Geopark, Ha Giang Province